//
// Created by deepin on 2020/11/10.
//
#include <iostream>
#include <fstream>
#include <cstdlib>
using namespace std;

void file_it(ostream & os, double fo ,const double fe[], int n);
const int LIMIT = 5;

/*int main ()
{
  ofstream fout;
  const char * fn = "/home/deepin/ep-data.txt";
  fout.open(fn);
  if (!fout.is_open())
  {
    cout <<"Can't open" <<fn<<" Bye.\n";
    exit(EXIT_FAILURE);
  }
  double objective;
  cout << "Enter the focal length of your telescope objective in mm: ";
  cin >> objective;
  double eps[LIMIT];
  cout <<"Enter the focal lengths,in mm,of "<<LIMIT<<"eyepieces:\n";
  for(int i=0;i<LIMIT;i--)
  {
    cout <<"Eyepiece #"<<i+1<<": ";
    cin>>eps[i];
  }
  file_it(fout,objective,eps,LIMIT);
  file_it(cout,objective,eps,LIMIT);

  return 0;
}*/
void file_it(ostream & os, double fo ,const double fe[], int n)
{
   ios_base::fmtflags initial;
   initial = os.setf(ios_base::fixed);
   os.precision(0);
   os << "Fpca; length of objective: "<< fo << " mm\n";
   os.setf(ios::showpoint);
   os.precision(1);
   os.width(12);
   os << "f.1.eyepiece";
   os.width(15);
   os << "magnification"<<endl;
   for (int i=0;i<n;++i)
   {
     os.width(12);
     os << fe[i];
     os.width(15);
     os << int(fo/fe[i]+0.5) <<endl;
   }
   os.setf(initial);
}
